| Küster, Dirk, Romer, Rolf L., Tolessa, Dandena, Zerihun, Desta, Bheemalingeswara, K., Melcher, Frank, Oberthür, Thomas (2009) The Kenticha rare-element pegmatite, Ethiopia: internal differentiation, U–Pb age and Ta mineralization. Mineralium Deposita, 44 (7) 723-750 doi:10.1007/s00126-009-0240-8 | Journal (article/letter/editorial) | 1007/s00126-009-0240-8 ARTICLE The Kenticha rare-element pegmatite, Ethiopia: internal differentiation, U–Pb...Springer-Verlag 2009 Abstract The Kenticha rare-element pegmatite, a globally important tantalite source...source in the Neoproterozoic Adola Belt of southern Ethiopia, is a highly fractionated, huge (2,000 m long...rareelement pegmatite class and belongs to the lithium–cesium– tantalum petrogenetic family. The Kenticha pegmatite...and spodumene-bearing upper zone. A monomineralic quartz unit is discontinuously developed within the upper | | | Journal (article/letter/editorial) | Pegmatitic Rocks and Minerals in the Kenticha Belt, Southern Ethiopia: Implication to Geological Setting...Ababa University, P. 0.Box 1176, Addis Ababa, Ethiopia (Manuscript received April 18, 2000; accepted...pegmatites, alaskites) and minerals from the Kenticha pegmatite field. The data shed light on the evolution...granite-pegmatites and associated mineralization in the Kenticha belt. The complex mineralization of commercial...signatures of the suite of felsic rocks of the Kenticha belt are predominantly similar to those generated | | Mogessie, A., Krenn, K., Schaflechner, J., Koch, U., Egger, T., Goritchnig, B., Kosednar, B., Pichler, H., Ofner, L., Bauernfeind, D., Tadesse, S., Demessie, M. (2002) A geological excursion to the Mesozoic sediments of the Abay Basin (Blue Nile), recent volcanics of the Ethiopian main rift and basement rocks of the Adola Rea, Ethiopia. Mitteilungen der Österreichischen Mineralogischen Gesellschaft, 147. | Journal (article/letter/editorial) | MAIN RIFT AND BASEMENT ROCKS OF THE ADOLA REA, ETHIOPIA by A. Mogessie, K. Krenn, J. Schaflechner, U...Addis Ababa University, Ethiopia 2Ethiopian Institute of Geological Surveys Ethiopia 43 44 1. GENERAL...INTRODUCTION The field excursion to Ethiopia took place from April 5 to 22, 2001. Ethiopia has a varied geology and...making up the Ethiopian plateau; ii) the Main Ethiopia Rift containing a number of lakes and geothermal...fields and iii) the Adola gold belt including the Kenticha tantalum-bearing pegmatites (Fig. 1). Nine earth | | | Journal (article/letter/editorial) | the PanAfrican Rocks of the Adola Area, Southern Ethiopia Solomon Tadesse Depnutnienf of Geology and Geophysics...Adola volcano-sedimentary sequence, in southern Ethiopia. Two major mineralized belts can be recognized:...recognized: the Megado ('Gold Belt') and the Kenticha Belts. The Kenticha Belt is also known for its rare metal...to conglomerates and meta-arkoses - auriferous quartz veins in high grade gneiss rocks This classification...exploration programme Key words: Adola, gold, Kenticha, Lega Dembi, Pan-African, rare metal, Sakaro. | | | Report (issue) | brucite of yore from the Tilly Foster mine in New York or Wood’s Chrome mine in Pennsylvania. In that the new...suggests material found in 2005 in the N’Chwaning III mine in South Africa, but N’Chwaning brucite is graywhite...fine cerussite specimens from the old Monteponi mine, Sardinia, Italy, which Tomek Praszkier of Spirifer...finds in the 1980s in an old, presumably unnamed mine on the property of the Piquín farmhouse in Córdoba...little things from the Jeffrey mine, Asbestos, Quebec: the enormous asbestos mine closed for good at the outset | | | Journal (article/letter/editorial) | (mainly Rwanda and the DR Congo), around the Kenticha mine (Ethiopia) and in the Alto Ligonha Province (Mozambique)...(Mozambique), the Arabian-Nubian Shield (Egypt, Ethiopia) and the Tantalite Valley pegmatites (southern...1992; Černý et al., 2005). The provenance of pegmatite magmas remains poorly understood. Based on a study...affiliation and rare-element signature of the granite-pegmatite systems”. Peraluminous granites and associated...Democratic Republic of the Congo (DRC), Mozambique, Ethiopia, Nigeria and Burundi (Table 1). Notably, the majority | | | Journal (article/letter/editorial) | evolution of the Neoproterozoic Adola Belt of southern Ethiopia: evidence for a Wilson Cycle process and implications...September 1995 Abstract The Adola Belt of southern Ethiopia comprises three major lithotectonic units: (i)...rocks and associated pelitic metasediments of the Kenticha terrain; (ii) high-grade gneisses and schists...continental margin and formation of ocean floor in the Kenticha Terrain, Wdirected subduction, arc development... Introduction The A d o l a Belt of southern Ethiopia (Fig. 1 ) is one of the major Neoproterozoic shear | | | Journal (article/letter/editorial) | Southern Ethiopia Tadesse Yihunie', Mamoru Adachi2 and Makoto Takeuchi2 Geological Survey of Ethiopia, P.O...O. Box 2302, Addis Abeba, Ethiopia, E-mail: yihunie63yahoo.com Department of Earth and Planetary Sciences...constitute the Kenticha, Alghe and Bulbul litho-tectonic domains in the Negele area of southern Ethiopia. Structural...relationships in semi-pelitic schistdgneisses of the Kenticha and Alghe domains, three episodes of metamorphic...590-640"C, and pressures of 4-5 kb and &7 kb in the Kenticha and Alghe domains, respectively. These results | | Melcher, Frank, Graupner, Torsten, Gäbler, Hans-Eike, Sitnikova, Maria, Henjes-Kunst, Friedhelm, Oberthür, Thomas, Gerdes, Axel, Dewaele, Stijn (2015) Tantalum–(niobium–tin) mineralisation in African pegmatites and rare metal granites: Constraints from Ta–Nb oxide mineralogy, geochemistry and U–Pb geochronology. Ore Geology Reviews, 64. 667-719 doi:10.1016/j.oregeorev.2013.09.003 | Journal (article/letter/editorial) | Schist Belt (western Zimbabwe) 4.3.3. Orange River Pegmatite Belt (Namibia, South Africa) AC 4.3.3.1. Radiometric...data 4.4.1.2. Mineralogy 4.4.2. Pegmatites of Ethiopia and Somalia 4.4.2.1. Radiometric data 4.4.2.2...3.2. Kamativi Schist Belt 5.3.3. Orange River Pegmatite Belt 5.4. Late Neoproterozoic to early Paleozoic...the Eastern Desert (Egypt) 5.4.2. Pegmatites of Ethiopia and Somalia 5.4.3. Alto-Ligonha Province (Mozambique)...presented for 13 rare-element granite NU and pegmatite districts in Africa, covering Archean, Paleoproterozoic | | | Report (issue) | ............................................M24 Mine Waste Characteristics ........................................................................M27 Mine Closure ..........................................regional lithium-cesium-tantalum rare-metalbearing pegmatite zoning above a parental granite.................zoned lithium-cesium-tantalum rare-metal-bearing pegmatite..............................................................M21 M13. Bar charts showing global mine production of niobium and tantalum, from 2000 to | | | Journal (article/letter/editorial) | the ophiolitic fold and thrust belts of southern Ethiopia: constraints on the tectonic regime during the...Neoproterozoic ophiolitic belts in southern Ethiopia—Megado, Kenticha, Moyale-El Kur and Bulbul. The mafic rocks...geochemistry, similar to that reported from the Kenticha Belt. Several samples from the Geleba area and...tectonic evolution of the Neoproterozoic of southern Ethiopia. © 2002 Elsevier Science B.V. All rights reserved...157–183 1. Introduction The Precambrian of southern Ethiopia, which consists of high-grade ortho- and para-gneisses | | | Journal (article/letter/editorial) | Structure of Precambrian Rocks in the Adola Goldfield (Ethiopia) based on Two Generations of Interference Pattern...Institute of Geological Survey of Ethiopia, P.O. Box 5580, Addis Ababa (Ethiopia) (Received December 71 1987;...structure of Precambrian rocks in the Adola Goldfield (Ethiopia) based on two generations of interference pattern...mapped in Precambrian rocks of the Adola Goldfield (Ethiopia). The F2 phase folded pre-existing planes (D1)...been active in the !ate Precambrian of southern Ethiopia. Introduction It is now generally accepted that | | Graupner, T., Melcher, F., Gäbler, H.-E., Sitnikova, M., Brätz, H., Bahr, A. (2010) Rare earth element geochemistry of columbite-group minerals: LA-ICP-MS data. Mineralogical Magazine, 74 (4) 691-713 doi:10.1180/minmag.2010.074.4.691 | Journal (article/letter/editorial) | during progressive evolution of the melt in a pegmatite body (either Nb ? Ta or Fe ? Mn fractionation...mineral-melt partitioning during crystallization of the pegmatite body and by secondary hydrothermal or weathering...causing addition, loss or redistribution of REE. Pegmatite bodies may contain up to several generations of...provide constraints on the genesis of rare-element pegmatite systems. Furthermore, it may be used as a valuable...LCT pegmatite locations of central and southern Africa. These include: (1) the Homestead pegmatite, Tantalite | | | Journal (article/letter/editorial) | southern Ethiopia Lulu Tsige a , Mohamed G. Abdelsalam b,∗ a Geological Survey of Ethiopia, Department...Regional Mapping, Addis Ababa, P.O. Box 2302, Ethiopia b The University of Texas at Dallas, Department...metamorphic data from the Bulbul Belt in southern Ethiopia indicating that the latest phase of the Neoproterozoic...migmatitic layering that is not evident elsewhere in the region. This older planar fabric is discordantly overprinted...the Neoproterozoic N-trending belts in southern Ethiopia were roots of northward expulsion of the Arabian-Nubian | | | Report (issue) | ....................................... 2 World Mine Production .......................................tsunami caused widespread 1 devastation across the region, as tens of thousands of people were killed, hundreds...Information Services Ltd., 2012). World Mine Production In 2011, world mine production of tantalum increased...in 2010. Rwanda accounted for 27 percent of total mine production in 2011; Brazil accounted for 20 percent;...Republic of the Congo [Congo (Kinshasa)], 15 percent; Ethiopia, 14 percent; China, 11 percent; Mozambique, 6 | | | Journal (article/letter/editorial) | PRECAMBRIAN PODIFORM CHROMITITES FROM KENTICHA HILL, SOUTHERN ETHIOPIA F. F. BONAVIA,* Universitd Pierreet...tinizedperidotitesbelongingto a metamorphic belt Kenticha Hill Chromitites that isLate Proterozoicin age...mineralogy,minDetailed mapping (Bogliotti, 1989) at Kenticha eral chemistry,and platinum-groupelement (PGE)...Precambrianrocks of southern On the eastern flank of Kenticha Hill, at an elevaEthiopiaare a three-foldsuccession;... microprobeanalysesof graphite-sericiteschist, quartz-rich schist, hornchromitesshowdifferingdegreesandtypesof | | Aurisicchio, Carlo, Conte, Aida M., Medeghini, Laura, Ottolini, Luisa, De Vito, Caterina (2018) Major and trace element geochemistry of emerald from several deposits: Implications for genetic models and classification schemes. Ore Geology Reviews, 94. 351-366 doi:10.1016/j.oregeorev.2018.02.001 | Journal (article/letter/editorial) | distinguishes the emerald deposits related to granite-pegmatite intrusion from those controlled by tectonic structures...3 conditions) between pre-existing quartz–muscovite or quartz–topaz greisens and ultramafic bodies...muscovite, phenakite (Be2SiO4), bromellite (BeO) and quartz within micaceous veinlets. The genesis of Malyshevsk...the phlogopitebearing contact zones, between pegmatite and surrounding Cr-bearing mafic-ultramafic rocks...pre-Karoo age. The genetic model for emerald-bearing pegmatite (Maria III and Niane) involves the intrusion of | | | Report (issue) | crisp despite partial dehydration) from the Margabal mine, Entraygues, Aveyron Department, France. 1 ==...======= Torbernite, 5.3 cm, from the Margabal mine, Entraygues, Aveyron, France. Trinity Minerals specimen...specimen and photo. This small uranium mine, in a small deposit discovered during a survey by the French...locality began in June 1997 when, somewhere in the old mine, about 1,000 fine specimens were recovered, with...with torbernite crystals to 2 cm perched on smoky quartz. In August 1997, four more pockets were opened | | | Journal (article/letter/editorial) | Rocks of the Neoproterozoic Adola Belt of Southern Ethiopia Bisrat Yibas Geology department, University of...Among the 27 samples analysed, only two samples are quartz areiiite with SiO, values above 89%. CaO-Na,O-K...Only two samples (the quartz arenites) fall in the Passive Margin (I'M) field. The trace element characteristics...oceanic tlioleiites and even boninites in the source region. The REE patterns show three distinct groupings;...1).It forms part of the Precambrian of southern Ethiopia where the Arabian-Nubain shield and the Mozambique | | Yan, Qing-He, Qiu, Zeng-Wang, Wang, He, Wang, Min, Wei, Xiao-Peng, Li, Pei, Zhang, Rong-Qing, Li, Cong-Ying, Liu, Jian-ping (2018) Age of the Dahongliutan rare metal pegmatite deposit, West Kunlun, Xinjiang (NW China): Constraints from LA–ICP–MS U–Pb dating of columbite-(Fe) and cassiterite. Ore Geology Reviews, 100. 561-573 doi:10.1016/j.oregeorev.2016.11.010 | Journal (article/letter/editorial) | com/locate/oregeo Age of the Dahongliutan rare metal pegmatite deposit, West Kunlun, Xinjiang (NW China): Constraints...online xxxx Keywords: Dahongliutan rare metal pegmatite deposit Kunlun orogenic belt Columbite-(Fe) and...Dahongliutan is a medium-size Li–Be–Ta–Nb rare metal pegmatite deposit in the Tianshuihai terrane, West Kunlun...represents the emplacement age of the pegmatite dikes. The ore-hosting pegmatite dikes are intimately time-space...reserves in China, implying that the Dahongliutan pegmatite deposit may also have favorable oreforming conditions | | | Journal (article/letter/editorial) | Orogeny: Evidence from the Bulbul Shear Zone, south Ethiopia Mohamed G. Abdelsalam a,⁎, Lulu Tsige b , Tadesse...Regional Mapping, Geological Survey of Ethiopia, Addis Ababa, Ethiopia Received 20 August 2007; received in...Neoproterozoic–Early Paleozoic Bulbul Shear Zone in southern Ethiopia is marked by sheared ophiolites at the interface...rights reserved. Keywords: Precambrian; Southern Ethiopia; Bulbul Shear Zone; Terrane rotation; East African...African Orogen 1. Introduction Southern Ethiopia is underlain by Neoproterozoic–Early Paleozoic rocks | | | Journal (issue) | Decade of Change A New Era for the Historic Coscuez Mine Esmeraldas Santa Rosa: Our Wealth is Green Rediscovery...More Exquisite Emeralds Magnificent Old Mine Emeralds 143 Mine Visit A Visit to Colombia’s “Green” Emerald...acquiring the majority stake in the iconic Coscuez mine in Colombia. The 2015 Symposium focused on the government’s...have also seen new discoveries of emeralds in Ethiopia and increased awareness of the green gem from...confidence in gem purchases now starts at the mine in the broader mine-to-market concept. Another major change | | Melcher, F., Graupner, T., Sitnikova, M., Henjes-Kunst, F., Oberthür, T., Gäbler, H.-E, Bahr, A., Gerdes, A., Brätz, H., Rantitsch, G. (2009) Ein Herkunftsnachweis für Niob-Tantalerze am Beispiel afrikanischer Selten-Element Pegmatite. Mitteilungen der Österreichischen Mineralogischen Gesellschaft, 155. | Journal (article/letter/editorial) | NIOB-TANTALERZE AM BEISPIEL AFRIKANISCHER SELTEN-ELEMENT-PEGMATITE von Frank Melcher1 , Torsten Graupner1 , Maria...Ta2O5 (Marropino, 2007); (Kenticha, 2007); Produktions-beginn Mocuba mine seit geringer artisanaler für...Granite paläoprotero-zoisch, spät-orogen LCT-Pegmatite Kokobin, Issia 6°N historisch bedeutend; derzeit...Amphibolite, Gneise, Granite archaisch LCT-Pegmatite Bikita, Benson 17-20°S 31-32°E Simbabwe Ghana...Birimian10 panafrikanisch, post-orogen LCT-Pegmatite Ijero/Ikoro, Iregun, Egbe, Wamba, Jemaa, Gurum | | | Journal (article/letter/editorial) | % from tin slag refining and 10 % from secondary mine concentrates. Due to rapid industrialisation and...Canada account for about 92 and 7 % of Nb world mine production, respectively. Since the bulk of the...maintenance. Ta production at the massive Greenbushes pegmatite (Australia) has stopped, though Li production...start-up time for new operations. The Kenticha mine (Ethiopia) is a past producer that may re-enter production...studies on new developments) are required in any mine as price levels vary for each deposit and are dependent | | AHMED, A, ARAI, S, ABDELAZIZ, Y, RAHIMI, A (2005) Spinel composition as a petrogenetic indicator of the mantle section in the Neoproterozoic Bou Azzer ophiolite, Anti-Atlas, Morocco. Precambrian Research, 138 (3) 225-234 doi:10.1016/j.precamres.2005.05.004 | Journal (article/letter/editorial) | basaltic pillow lavas (about 500 m), diorite to quartz diorite, and volcanosedimentary sequence (about...composition for each pod. Spinel compositional field represents chromitites of the Neoproterozoic ophiolites...The average spinel composition of Kenticha Hill chromitite, Ethiopia, star symbol, is also used for comparison...podiform chromitite deposits from the Kenticha Hill, Ethiopia (Bonavia et al., 1993) also has high-Cr#s...hills of the Sudan (Hussein et al., 2004), Kenticha Hill, Ethiopia (Bonavia et al., 1993), and Saudi Arabia |
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Kenticha mine, Kenticha pegmatite field, Oromia Region, Ethiopia